Who are you teaching? assuming assuming because your a new instructor its younger kids/ beginners prepare to have your skis run over a ton. If you want to keep them mint that's not going to happen.. Personal experience I've had 2 sets of skis where the the top sheet has seen major damage an gashes almost to the core, as well as chunks come out of the base at the back of the ski due to being run into from behind. I taught mainly 4 -6 year olds even though i was a level 2 CSIA instructor.
My suggestion.
Buy a really nice set of all mountain skis that you can shred the pow and also rail on groomers for the rare opportunity that you get to ski on your own or when you get a client that actually knows what they are doing. Use you 6 year old fugitives to teach the majority of your beginner lessons on.
Hope that helps. Have fun.